Using Wi-Fi to “see” behind closed doors is easier than anyone thought

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Wi-Fi fills our world with radio waves. In your home, in the office, and increasingly on city streets, humans are bathed in a constant background field of 2.4- and 5-gigahertz radio signals. And when people move, they distort this field, reflecting and refracting the waves as they go.

That’s given more than one group of researchers an interesting idea. In theory, they say, it ought to be possible to use this changing electromagnetic field to work out the position, actions, and movement of individuals. Indeed, several groups have created imaging systems that use Wi-Fi to “see” through walls.

But all these systems have drawbacks. For example, they rely on knowing the exact position of the Wi-Fi transmitters involved and need to be logged in to the network so that they can send known signals back and forth.

That isn’t possible for the ordinary snooper or peeping tom, who might typically…

For the rest of the article, please visit https://www.technologyreview.com/s/612375/using-wi-fi-to-see-behind-closed-doors-is-easier-than-anyone-thought/.

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Last modified: November 13, 2018

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